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WO/2001/017087A1 |
The invention relates to a protection circuit for a series connection consisting of low-side switches and an inductive user. A power field-effect transistor representing a low-side switch can be controlled by a control circuit according ...
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WO/2001/006272A1 |
An apparatus and method for detecting short circuits in a power conversion circuit and a motor drive incorporating the same. The circuit is gated and subsequently a DC bus charger is activated. Charge on the DC bus is measured to indicat...
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WO/2001/001540A1 |
The invention relates to a method for preventing making on existing short circuits in branches. The supply is connected for a short time in a testing circuit, at a given time in the supply voltage, and at least the current in the checkin...
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WO/2000/063608A1 |
A safety lock out switch system for the prevention of an unexpected restart of an electrically powered machine in whose main power circuit it is installed. Therein the power-free status of the power supply output of the system is confirm...
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WO/2000/064026A1 |
A safety lock out switch system for the prevention of an unexpected restart of an electrically powered machine in whose main power circuit it is installed. Therein the power-free status of the power supply output of the system is confirm...
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WO/2000/062395A1 |
The invention relates to a protective circuit for electronic modules, especially driver modules, for protecting against polarity reversal and against rupturing of the neutral conductor. A first protective diode (D1) is arranged, with the...
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WO/2000/062393A1 |
The invention relates to a protective circuit for an electronic device. Said protective circuit is located between a DC source (U¿v?) and the circuit voltage input of the device (G). The protective circuit consists of the serial connect...
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WO/2000/042688A1 |
A circuit that reacts in a reliable manner to voltage polarity reversal can be produced in a simple manner, consisting of an interrupting fuse (4) comprising a pyrotechnic ignition element (6) that is activated by a control current when ...
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WO/2000/024107A1 |
The invention relates to a reverse polarity protection circuit for a power output stage with at least one highside semiconductor switch that requires a control voltage that is greater than the plus potential of the supply network and whi...
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WO/2000/021179A1 |
A battery protection circuit (10) for an external battery pack (14) has a switch (80) for controlling connection of a battery output to a load, and a detector for detecting a resistance at a load output terminal. A first comparator (50) ...
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WO/2000/014847A1 |
The invention relates to a polarity reversal protection circuit for a final electronic power stage that can be controlled via a control circuit, whereby the connection of a wrongly applied supply voltage to a control circuit and a final ...
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WO/2000/008734A1 |
The controlled system of a field effect transistor is used instead of a decoupling diode as active polarity reversal protection and the control input of the field effect transistor is controlled in such a way that the field effect transi...
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WO/1999/060683A1 |
A battery protection circuit (10) for an external battery pack (14) has a switch (40) for controlling connection of a battery output to a load, and a detector (44) for detecting a resistance at a load output terminal. A first comparator ...
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WO/1999/054982A1 |
A polarity reversal protection circuit comprising a freewheeling diode (18) that is parallel connected to the load (14) and series connected with respect to a semiconductor switch (30). The semiconductor switch (30) is switched on when a...
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WO/1999/054983A1 |
The invention relates to a polarity reversal protection circuit in which a semiconductor switch (11) is connected in parallel with regard to the polarity reversal protection diode (10). Said semiconductor switch is opened during the occu...
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WO/1999/028683A1 |
When a plurality of air conditioners are stopped during operation due to power interruption and then the power supply is recovered, the air conditioners are not restarted simultaneously so that an overcurrent does not flow through the fe...
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WO/1999/019958A1 |
The invention relates to an inexpensive, low-power protective circuit for electronic circuits (E) in which a destruction of the electronic circuit should be reliably prevented during polarity reversal of the supply voltage. To this end, ...
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WO/1999/005780A1 |
The invention relates to a control circuit for a dc motor with clocked control, comprising an electrolytic capacitor connected in parallel and a freewheeling diode. The aim of the invention is to reduce noise radiation. To this end, an i...
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WO/1999/005763A1 |
The invention relates to a control circuit for a direct current motor with a reverse pole protection device, which is connected to the electric circuit of the electrolytic capacitor and the free-wheeling diode in order to reduce losses i...
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WO/1998/052268A1 |
The invention relates to a circuit for protecting consumers from damage caused by polarity reversal in an electrical system, comprising a limiter and a tripping device, wherein the system voltage supply is limited when polarity is revers...
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WO/1998/047324A2 |
A transformer control circuit (10) which includes a ground fault detection circuit (52) that detects ground fault currents in the transformer secondary (42, 44) and delivers a ground fault detection signal to the primary circuit. This ci...
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WO/1998/044610A1 |
The invention relates to an operating device for carrying out switching operations in a switching system (3), especially a medium voltage switching system. Said operating device (1) has an electronic memory card (9) for modifiable storag...
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WO/1998/040944A1 |
The invention relates to a power switch (1) which is used in a single- or multi-phase alternating current network (L1, L2, L3), and comprises an electronic circuit breaker (2) operating as a result of auxiliary energy provided by a circu...
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WO/1998/033255A1 |
A protecting device has a disconnecting contact (13) connected to the load current line (2) and actuated by an electromagnetic system (9). A shunt circuit leads from the side of the disconnecting contact (13) opposite to the battery to a...
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WO/1998/024161A1 |
An apparatus and method for the avoidance of electrical shock in an electrical system. For a two wire appliance, the device consists of a current interrupting circuit that bidirectionally impedes current flow for short time intervals in ...
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WO/1998/013922A1 |
A circuit for protecting electronic load circuitry from the backwards installation of a battery is provided. The circuit includes an n-channel or a p-channel MOSFET transistor having a gate, a source and a drain. The gate is to be normal...
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WO/1998/010501A1 |
A phase monitor for a short-circuited asynchronous three-phase motor (10) comprises a first and a second sensing unit (14, 15), both of which are connected to a supply voltage line (11) to the motor (10) in order to sense the voltage con...
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WO/1998/005111A1 |
A switching installation (1a, 1b, 1c) for high or medium voltage applications is disclosed. The object of the invention is to provide an easy and practical solution to transmit information with a high reliability. For that purpose, field...
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WO/1998/001928A1 |
An electromechanical switching device (10) ensures automatic selected polarity interconnection between terminals of two power sources (14, 12). A double pole double throw (DPDT) switch (34) has three pairs of contacts. A first pair of le...
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WO/1997/045905A1 |
An installation for power transmission by means of high-voltage direct current has at least two converter stations which are interconnected by means of a dc line (DL), at least one station (SR1) having a line protection device (LP) adapt...
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WO/1997/027657A2 |
A current limting circuit in which, when the input d.c. voltage (UE) is raised from zero volt to the reference voltage (Usoll) by the connected load (RL, CL), an output d.c. voltage (IA), flows only when the value of the input d.c. volta...
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WO/1997/026698A1 |
The invention concerns a connector (1), in particular a plug-in connector for TT and TN networks, in which an electronic monitoring and control unit (2) supplied with a voltage switches lines (8, 9, 10) through, by means of a switch (5),...
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WO/1997/026695A2 |
Described is a connector for consumer networks (1, 2) which creates a connection with no short-circuit within permitted operating limits by means of at least one switch (5). In addition to current (6) and voltage (7) sensors with their a...
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WO/1996/037939A1 |
A circuit for the avoidance of electrical shock and burns in an electrical appliance. Designed primarily for a two wire appliance, the device consists of a conditioning circuit at the load and a fault sensor/interrupter at the plug. The ...
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WO/1996/027932A1 |
A power supply circuit includes first and second battery terminals (15, 20) for electrical connection to the battery. The first and second battery terminals (15, 20) are connected to a first transistor switching circuit (35). The first t...
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WO/1996/008861A1 |
Electronic device for controlling the electrical wire connections between an equipment and the electrical circuit line, comprising: circuit means for detecting the voltage of each wire; logic means for comparing the detected voltages wit...
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WO/1995/024725A1 |
A device is disclosed for monitoring the safety of operation of power switches (diagnosis apparatus), in particular vacuum power switches in medium voltage switchboards. The device has a microprocessor unit (ME) that consists of micropro...
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WO/1994/018737A1 |
A drive train for an electric vehicle includes a traction battery, a power drive circuit, a main contactor for connecting and disconnecting the traction battery and the power drive circuit, a voltage detector across contacts of the main ...
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WO/1994/012998A1 |
An automotive battery charger (20) or other electrical device which draws substantial amounts of power is provided with a variable delay mechanism (70) which prevents turn on of the device when power is applied. The duration of the delay...
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WO/1994/003952A1 |
A reverse-polarity protection is disclosed for coupling an electric circuit (2) to an energy and information conducting conductor system (3). At least one coupling path (5) comprises a controllable element (4) as reverse-polarity protect...
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WO/1994/003956A1 |
A reverse-polarity protection is disclosed for coupling an electric circuit (2) to an energy and information conducting conductor system (3). At least one coupling path (5) comprises a controllable element (4) as reverse-polarity protect...
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WO/1993/010588A1 |
Proposed is a reverse-supply protection device for power output stage transistors, the device having, connected in series with the output-stage transistor (10), a reverse-poled FET (12) intended as a reverse-supply protection element. Th...
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WO/1992/003867A1 |
Surge suppressor device (10) for connection into a circuit, comprising a transient suppressor (14) and indicator means (16, 18). The transient suppressor (14) limits transient voltages in the circuit. The indicator (18) provides indicati...
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WO/1992/002066A1 |
A process control instrument (10) receiving a DC current from a two wire loop (11, 43) having overcurrent protection (16, 52) and reverse current protection (20, 54) circuits interposed between a two wire loop (11, 43) and a process cont...
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WO/1990/009694A1 |
A protection device (1, 10) for connection between an electrical supply and electrical apparatus includes a circuit breaker to interrupt the supply when an open neutral or live conductor is detected. The protection device includes means ...
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WO/1990/007813A1 |
Short-circuits due to faulty installation may occur in an intermediate circuit inverter or in a load connected to the latter. If under normal operating conditions the intermediate circuit voltage is switched through to the short-circuit ...
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WO/1990/006012A1 |
An integrated semiconductor circuit for use in a low voltage (1.5 - 2 V) battery operated device is provided with a protection circuit against reverse connection of the battery. The protection circuit takes care that the substrate is alw...
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WO/1990/005918A2 |
A measurement circuit in the output circuit of the sensor, for example, determines the polarity of the user circuit applied to its terminals. Whichever of the two states is detected is stored in a storage element and the correct driver i...
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WO/1989/011338A1 |
A circuit arrangement for the high-voltage supply of an electrostatic filter, in particular an electrostatic soot separator for diesel engines, has a high-voltage generator (20) located on a current supply (15) and a shielded high-voltag...
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WO/1989/011747A1 |
An electrical safety apparatus arranged to be connected between an electrical power source and a load to provide protection against electric shock due to, for example, the insertion of probes or needles into a potentially live socket by ...
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